US3586415A
Expired / Lapsed
US
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Light modulator element
Assignee: Hitachi Ltd
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Filing: 1969-03-25
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Granted: 1971-06-22
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Expires: 1989-03-25
Abstract
Abstract A device for modulating and a nondestructive readout storage device employing modulation of light transmitted through an irregular ferroelectric crystal before and after the rotation of the vibration plane thereof caused by an applied electric field equal to or larger than the coercive field thereof.
Inventors
- 👤 Akio Kumda
- 👤 Yoshio Furuhata
- 👤 Keiichiro Aizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:30
CPC Classifications
H; H01; H01G; H01G7/00; H01G7/02; H01G7/025; G; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/05
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
117 words
A device for modulating a beam of light comprising a pair of light polarizer plates disposed substantially in parallel with each other and having their surfaces substantially perpendicular to the direction of incident light thereon, an irregular ferroelectric element having a pair of Z-cut planes, said irregular ferroelectric element being arranged between said pair of light polarizer plates in such a manner that said Z-cut planes of said element are substantially parallel to said light polarizer plates, a pair of transparent electrodes each provided on each of said pair of Z-cut planes, and means for applying an electric field not lower than the coercive field of said element across said element through said pair of transparent electrodes.
Claim 2
Independent Claim
117 words
A device for modulating a beam of light comprising a pair of light polarizer plates disposed substantially in parallel with each other and having their surfaces substantially perpendicular to the direction of incident light thereon, an irregular ferroelectric element having a pair of Z-cut planes, said irregular ferroelectric element being arranged between said pair of light polarizer plates in such a manner that said Z-cut planes of said element are substantially parallel to said light polarizer plates, a pair of transparent electrodes each provided on each of said pair of Z-cut planes, and means for applying an electric field not lower than the coercive field of said element across said element through said pair of transparent electrodes.
Claim 3
Dependent Claim
19 words
A device according to claim 1, further comprising a quarter wavelength plate for the central wavelength of white light.
Claim 4
Dependent Claim
57 words
A device according to claim 1, wherein said irregular ferroelectric material is a single crystal having molybdate gadolinium oxide structure represented by (RxR''1 x)203.3Mol eWe03, where R and R'' are at least one element of the rare earths, x is a number of from 0 to 1.0, and e is a number of from 0 to 0.2.
Claim 5
Dependent Claim
36 words
A device according to claim 1, wherein each of said pairs of transparent electrodes comprises a plurality of parallel strips at equal intervals, said strips comprising oppositely biased electrodes crossing over substantially perpendicularly to each other.
Claim 6
Dependent Claim
17 words
A device according to claim 4, wherein said electrodes are made of one of SnO3 and InO2.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |